Heater for repairing bituminous and asphalt pavements.



No. 788,582. PATENTED MAY 2, 1905.

G. H. FAIRGHILD & R. R. PIERSON. HEATER FOR REPAIRING BITUMINOUS AND ASPHALT PAVEMENTS.

APPLIGATION FILED AUG-.10,1904.

NITED STATES Patented May 2, 1905.

PATENT OFFICE.

GEORGE H. FAIROHILD AND RICHARD R. PIERSON, OF SAN FRANCISCO, CALIFORNIA.

HEATER FOR REPAIRING BITUMINOUS AND ASPHALT PAVEMENTS.

SPECIFICATION forming part of Letters Patent No. 788,582, dated May 2, 1905.

Application filed August 10, 1904:. Serial No. 220,199-

To (ti/Z 11/77/0711 it may concern:

Be it known that we, GEORGE H. FAIR- CHILD and RICHARD R. PIERSON, citizens of the United States, and residents of the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Heaters for Repairing Bituminous and Asphalt Pavements; and we do hereby declare the following to be a full, clear, and exact description of the same.

Our invention relates to the class of heaters especially intended for use in connection with the repair of bituminous and asphalt pavements. Pavements of this nature when worn into holes are generally repaired either by wholly removing the material within the worn area and putting in fresh material or by adding the fresh material without any previous preparation of the hole. The former course is wasteful and the latter plan ineffective, because the fresh material will not adhere to the old material, and a bad repair job is the result. The better plan is to first heat the material in the worn area and then add fresh material. In this way a saving is had, and the old and new material adhere perfectly and make a good job. Heaters for thispurpose have heretofore been very large, expensive, and awkward to handle.

It is the object of our invention to provide a simple, cheap, and effective heater for this purpose; and to this end our invention consists in the novel construction hereinafter fully described by reference to the accompanying drawings, in which- Figure 1 is a top plan of our heater, a portion of the water-reservoirbeing broken away. Fig. 2 is a side view, partly in section, of our heater.

1 and 2 are concentric spaced pipes, the outer pipe 1 being sufliciently larger in diameter than the inner pipe 2 to leave a suitably capacious space between them for the volume of air induced by the flame and products of combustion passing through the inner pipe. Both pipes at one end enter and are secured in a head 3, to which is fitted any kind of a burner adapted to burn oil, either crude or its distillates. The burner here shown (indicated by 4) is a well-known type adapted for gasolene and needs no detailedexplanation, it being suflicient to point out that the initial supply of gasolene to be ignited is furnished by the lower pipe and the continuing vapor is furnished by the upper pipe. This burner communicates with the inner pipe 2. Around the end of the outer pipe just in advance of the head 3 are air-inlets 5, the capacity of which is controlled by a turnable damper-sleeve 6, provided with holes adapted to coincide more or less completely with the air-inlets 5.

The forward end of the inner pipe 2 is slightly reduced for a discharge and terminates within the outer pipe, which latter is reduced just beyond the end of the inner pipe and thence is extended and bent downwardly to its discharge, which terminates in a heatconfining hood 7. This hood is open on the bottom, and in order to make it conform approximately on its lower edge to inequalities of surface its sides are provided with vertically-adjustable supplementary sides 8, the lowering of which serves to lit the hood to any surface with suflicicnt precision to confine the heat. These adjustable supplementary sides 8 serve the further purpose of providing for such escape from the hood of the heated air and gases of combustion as may be necessary for proper circulation. Inpractice the inequalities of the ground are usually suflicient to leave spaces under the sides for the escape of the air and gases; but, if need be, one or more of the sides may be lifted to provide such space, While in general the hood oonformsapproximately, as stated, to the ground with sufficient closeness to confine the heat to the extent necessary.

Supported from and above the heater is a water-reservoir 9, from which a pipe 9, controlled by a cock 10 and providedwith a sightglass 11, leads down into the pipe 1 and is adapted to supply the necessary moisture to keep the material being heated from burning.

The whole device is carried upon a suitable truck 12.

The operation is as follows: The flames and heated products of combustion from the burner 4:, projected through the inner pipe 2, induce a volume of air to enter the outer pipe 1 through the inlets 5. This air is heated by pipe 2 and is projected doWn upon the area of pavement inclosed by the hood 7, said hood serving to confine it sufficiently to heat the pavement. The steam from the Water, the amount of which can be observantly regulated, prevents the material from burning. The device is very effective and can be readily moved from place to place.

The flames from the burner l terminate slightly beyond the discharge end of the inner pipe 2 and reach but a short distance into the extension of the outer pipe, so that they do not enter the hood and cannot burn the pavement. The heat relied upon is furnished by the air induced through the pipe 1 and heated in passing over the pipe 2.

Having thus described our invention, What We claim as new, and desire to secure by Letters Patent, is

1. A heater comprising concentric spaced pipes, the inner pipe terminating at its discharge end Within the outer pipe, and the outer pipe having at one end air-inlets, its other end extendingoeyond the inner pipe and directed to the surface to be heated, a burner communicating With the inner pipe to direct its flame and products of combustion through said pipe and induce a current of air to enter the outer pipe in contact With the inner pipe and to pass through said outer pipe to the surface to be heated, and a hood to surround said surface and to receive the heated air from the outer pipe.

2. A heater comprising concentric spaced pipes, the inner pipe terminating at its discharge end Within the outer pipe, and the outer pipe having at one end air-inlets, its other end extending beyond the inner pipe and directed to the surface to be heated, a burner communicating with the inner pipe to direct its flame and products of combustion through said pipe and induce a current of air to enter the outer pipe in contact With the inner pipe and to pass through said outer pipe to the surface to be heated, and ahood to surround said surface, and to receive the heated air from the outer pipe, said hood having adjustable supplementary sides.

3. A heater comprising concentric spaced pipes, the inner pipe terminating at its discharge end Within the outer pipe, and the outer pipe having at one end air-inlets, its other end extending beyond the inner pipe and directed to the surface to be heated, a burner communicating With the inner pipe to direct its flame and products of combustion through said pipe and induce a current of air to enter the outer pipe in contact With the inner pipe and to pass through said outer pipe to the surface to be heated,means for supplying Water to said outer pipe, and a hood with which the discharge end of the outer pipe communicates, said hood being disposed to surround said surface to be heated.

L. A heater comprising concentric spaced pipes, the inner pipe terminating at its discharge end Within the outer pipe, and the outer pipe having at one end air-inlets, its other end extending beyond the inner pipe and directed to the surface to be heated, a burner communicating with the inner pipe to direct its flame and products of combustion through said pipe and induce a current of air to enter the outer pipe in contact With the inner pipe, and to pass through said outer pipe to the surface to be heated, means for supplying Water to said outer pipe, and a hood at the discharge end of the outer pipe, disposed to surround said surface to be heated, said hood having adjustable supplementary sides.

5. A heater comprising concentric spaced pipes, the inner pipe terminating at its discharge end Within the outer pipe, and the outer pipe having at one end air-inlets With a controlling turnable damper-sleeve, and its outer end extending beyond the inner pipe and directed to the surface to be heated, a burner communicating with the inner pipe to direct its flame and products of combustion through said pipe and induce a current of air to enter the outer pipe in contact With the inner pipe and to pass through said outer pipe to-the surface to be heated, means for supplying Water to said outer pipe, andahood at the discharge end of the outer pipe disposed to surround said surface to be heated, said hood having vertically-adjustable supplementary sides.

6. A pavement-heater comprising a suitable frame, a hood carried thereby dis posed to cover the surface to be heated, a horizontally-disposed pipe carried by the frame, the extended forward end of said pipe communicating with the hood, and its rear end having air-inlets, a second pipe Within the rear part of the first pipe and separated therefrom to leave an intervening annular space, said second pipe opening Within the first pipe and serving as a heating-surface for the air induced to enter the annular space through the rear inlets, and a burner fitted to the rear end of said second pipe.

7. A pavement-heater comprising a suitable frame, a hood carried thereby and disposed to cover the surface to be heated, said hood having adjustable supplementary sides to conform the hood to said surface, a horizontally-disposed pipe carried by the frame, the extended forward end of said pipe communicating With the hood, and its rear end having air-inlets, a second pipe Within the rear part of the first pipe and separated therefrom to leave an intervening annular space, said second pipe opening Within the first pipe and serving as a heating-surface for the air induced to enter the annular space through the rear inlets, and a burner fitted to the rear end of said second plpe.

8. A pavement-heater comprisinga suitable frame, a hood carried thereby and disposed to cover the surface to be heated, said hood having adjustable supplementary sides to con form the hood to said surface, a horizontally-disposed pipe carried by the frame, the extended forward end of said pipe communicating with the hood, and its rear end having air-inlets, a second pipe within the rear part of the first pipe and separated therefrom to leave an intervening annular space, said second pipe opening within the first pipe and serving as a heating-surface for the air induced to enter the annular space through the rear inlets, a burner fitted to the rear end of said second pipe, and a Water-reservoir carried by the frame, having a controllable communication 1 with the outer pipe.

9. A pavement-heater comprising a suitable frame,a hood carried thereby disposed to cover the surface to be heated, a horizontally-disposed pipe carried by the frame, the extended forward end of 'said pipe communicating with the hood, and its rear end having air-inlets, a second pipe within the rear part of the first pipe and separated therefrom to leave an intervening annular space, said second pipe opening within the first pipe and serving as a heating-surface for the air induced to enter the annular space through the rear inlets, a burner fitted to the rear end of said second pipe, and a Water-reservoir carried by the frame, having a controllable communication with the outer pipe.

In witness whereof We have hereunto set our hands.

GEORGE H. FAIRCHILD. RICHARD R. PIERSON. l/Vitnesses:

WALTER F. VANE, D. B. RICHARDS. 

